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/freebsd-9.3-release/sys/boot/i386/cdboot/
H A Dcdboot.Sdiff 157652 Tue Apr 11 02:39:29 MDT 2006 sobomax When enabling A20 put upper limit on amount of time we wait for the keyboard
controller to get ready (65K x ISA access time, visually around 1 second).
If we have wait more than that amount it's likely that the hardware is a
legacy-free one and simply doesn't have keyboard controller and doesn't
require enabling A20 at all.

This makes cdboot working for MacBook Pro with Boot Camp.

MFC after: 1 day

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